
	pre 0
	post 0
	pre 1
		inner 2
	post 2
	pre 3
	post 3

---

	pre 0
		inner 0
	post 0
	pre 1
		inner 1
		inner 2
	post 2
	pre 3
		inner 3
	post 3

---

	pre a 0
		inner a 0
		inner b 1
		inner c 2
	post c 2
